In this chapter, we examine participation rate and time use trends in volunteering in Scandinavia during the period from the beginning of the 1990s until the mid-2010s. The aim of the analysis is twofold. First, we aim to provide a descriptive analysis of the trends in volunteering in Scandinavia during the period under investigation. Second, we aim to determine whether and to what extent the socio-demographic and institutional changes in the Scandinavian societies during this period can explain the observed trends in volunteering. The results show that the overall levels of participation in volunteering are high and stable in the Scandinavian countries, with a small upward trend. The participation levels are all high in international comparisons, but they are markedly higher in Norway and Sweden than in Denmark. Volunteers’ contributions of time appear relatively stable in Norway, but Denmark has witnessed a slight decline and Sweden has witnessed a slight increase. The explanatory analysis revealed that nearly half of the upward trend in the levels of volunteering can be attributed to the expansion of education in the Scandinavian countries. The explanatory analysis also indicated that the gap in the levels of volunteering between Sweden and Norway on the one hand, and Denmark on the other hand, cannot be attributed to socio-demographic differences between the countries, as the gap is left unchanged when controlling for socio-demographic factors.